How should I configure my QDisk, cman, and totem timing settings in /etc/cluster/cluster.conf to account for path failures when using a multipath map for the quorum device?
Issue
- How high should I configure the QDisk timings in
/etc/cluster/cluster.confto account for multipath path failures? - Do I need to set my
quorumd,cman, andtotemtimings to be larger than the amount of time it takes for a path to fail? - Is there a way to test the time it takes for a multipath path to failover so that qdisk is properly configured?
- When a storage path to the quorum device fails or becomes unresponsive, the node is evicted before it can switch to the next available path in the multipath map.
- When I experience a path failure on my qdisk, the following message is printed even thought there is an available active path(s):
openais[2677]: [CMAN ] lost contact with quorum device
Environment
- Red Hat Enterprise Linux Server 5 (with the High Availability Add on)
- Red Hat Enterprise Linux Server 6 (with the High Availability Add on)
- Cluster configured with a quorum device (qdisk) in /etc/cluster/cluster.conf
- Cluster configured to use a device-mapper-multipath map as the quorum device
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